... Memory Card MMC card,SD card,TFcard(SD card adapter required),minMusic formatMP3,WMASupport the maximum memory card ... screen displayFrequency Response0-20khzSpeaker Output Power2*10mwAudio OutputHi-Fi Stereo HeadsetFM 76MHZ-108MHZBattery TypePolymer lithium batteryInput PowerComputer USB ... humidity15-85 RHNet weight190gDimensions20*15*90mm Potable wireless stereo bluetooth headset 5hours operation